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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d530537961aeb467972b24cd4008987b52c70c12def4d55fd22e4edead2bd6' 
  AND token = 'LC3mQePmzrUPKGhJkDcD1RokNdxryFs9Vpn8361z+sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}